What blood type will my child have?

Pick the two parents' blood groups: see which groups (ABO and Rh) are possible for the children and which are genetically excluded.

Parent 1

Parent 2

How inheritance works

Each parent passes on one of their two ABO alleles: group A can pass A or O, group B passes B or O, AB passes A or B, and O only passes O. A and B are dominant over O. For the Rh factor, + is dominant: two Rh− parents can only have Rh− children, while two Rh+ parents can also have Rh− children.

The surprising case

An AB parent and an O parent can have neither AB nor O children: only A or B. And two group-A parents can absolutely have an O child, if both carry the silent allele.